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Scrophulariaceae) J. Adelaide Bot. Gard. (15)1: 71-74(1992) NEW AUSTRALASIAN SPECIES OF PEPLIDIUM AND GLOSSOSTIGMA (SCROPHULARIACEAE) W.R. Barker State Herbarium, Botanic Gardens, North Terrace, Adelaide, South Australia 5000 Abstract Peplidium foecunclum W.R.Barker from arid central and south-eastern Australia and Glossosti gma cleistanthum W.R.Barker from central and south-eastern Australia and New Zealand are formally named and described. Two species, respectively from the genera Peplidium and Glossostigma, are newly described to provide names for their treatment in the forthcoming Flora of New South Wales (Barker et al., in press). Both species occur in central and south-eastern arid Australia, but the Glossostigma extends into higher rainfall areas of south-eastern mainland Australia and to New Zealand. Their evolutionary relationships, adaptations and biogeography haVe been dealt with previously in a paper on the subtribe Mimulinae (Barker 1982). Attention is also drawn to the recent description of a new Peplidium in arid Australia (Barker 1990). Peplidium foecundum W.R. Barker, sp. nov. MicrocarpaealPeplidium sp. D: W.R. Barker, Evolution FL Fauna Arid Austral. (1982) 343-347. P. sp. D: W.R. Barker in Jessop & Toelken, FL S. Austral. (1986) 1289, fig. 586C. P. luanifusum auct. non Delile: Tate, Hdbk FL Extratrop. S. Austral. (1890) 153, 253. P. maritimum auct. non (L.f.)Asch.: J. Black, Trans. R. Soc. S. Austral. 57 (1933) 156. Species nova speciebus staminibus duobus fructibusque indehiscentibus affinis; a P. maritimo (L.1)Asch. (syn. P. humifusum Delile) differt fructibus seminibusque maioribus, a ceteris corollis e calyce vix exsertibus fructibusque abundantibus. Holotypus: W.R. Barker 3545, 16.ix.1978, South Australia. Region 2: Lake Eyre Basin. Stuart Highway, ca. 46 km by road S of Coober Pedy (29`25'S 134°48WE).Prolific, intermixed with Peplidium spp. (Barker 3544, 3546) and Limosella curdieana.Small claypan, dried out, in gibber plain; low open shrubland. Prostrate, large- succulent-leaved herb. Corolla reduced, but 2-lipped, the upper shorter than the lower, the lips palish blue with yellow-green spot on lower side of mouth, stigma slowly irritable. AD97925247. Isotypi: 4 duplicates to be distributed. Prostrate ?annual, moderately densely eglandular pubescent, with branches to c. 20 cm long. Leaves fleshy; petiole to 0.6 cm long; blade ovate to elliptic, to 2.5 cm long, obtuse. Flowers single, in most bract axils; pedicel 0-2 mm long. Calyx narrow cylindrical, 2-3 mm long, enlarging in fruit.Corolla obscure, c. 3-4 mm long, pale blue to ?white, with the lower side of the mouth yellow-green with no obvious palate; lips very short. Stamens 2. Capsule ovoid to -.± globular, 3-4.5 mm long; seeds 0.7-1.4 mm long, furrowed. P. foecundum is confined to the central arid regions of Australia, in all mainland states except Western Australia and Victoria. It grows in and beside ephemeral pools in clay to loam soils, often on gibber plains. 71 W.R. Barker J. Adelaide Bot. Gard. (15)1 (1592) This species is notable amongst its c,ongeners for its capacity to produce prolific fruits, from which is derived the specific epithet (from the Latin adjective foecundus meaning fruitful or bountiful). The fruits appear clustered in leaf axils, because of their being borne on axillary short shoots.It shares with P. maritimum a small corolla, but in P. foecundum the lips are not prone to spreading like all other species. Tbis characteristic together with the abundant fruits and the low pollen-ovule ratio has led to the proposal that the flowers are at least facultatively autogamous (Barker 1982). Selected specimens examined (73 total seen) NORTHERN TERRITORY. BARKLY TABLELAND (1seen):W. Holtze 229,1895, Powell's Creek. MEL560956. CENTRAL AUSTRALIA NORTH (1 seen): W.R. Barker 2825A(p.p.), 19.viii.1978, Tanami Desert; c. 4.5 km by road WSW of Kims Bore on track to Ferdies Bore; c. 30 km WNW of Mongrel Downs Homestead. AD (2 sheets; 3 dupls.). CENTRAL AUSTRALIA SOUTH (7 se,en): AC. Beauglehole 2800315, 29.vii.1978, Simpson Desert, 8.9 miles W of Old Andado Homestead, 3.1 miles E of New Andado Homestead. - P.K. Latz 2601, 24.v.1972 Tobermorey Station. AD (2 sheets) (ex NT). - R Swinbourne 804, 24.xi.1964, 10 miles SW Alice Springs. AD, CANB, NSW, MEL, NT. SOUTH AUSTRALIA. NORTH-WESTERN (1 seen): R. Bates 19783, 5.vi.1989, Marla. AD. LAKE EYRE (34 seen): D.E. Symon 5703, 17.viii.1968, 31 km S of the Cooper crossing at Innamincka (N end of Sttzelecki Creek). AD (formerly ADW); n.v.: CANB, K, L - F.J. Badman 1127, 1.vi.1984, McAlpine Bore, Anna Creek Station, 7 km W of William Creek. AD; (1 dupl.). - R Bates 19827, 7.vii.1989, About Copper Hills. AD. - T.R.N. Lothian 1374, 7.viii.1963, 9 miles (c. 14 km) N of Warrina. AD; n.v.: NSW NT. - W.R. Barker 3545 (see holotype). GAIRDNER-TORRENS (4 seen): F.J. Badman 2842, 24.vi.1989, 2 km N of Stuart Creek Opal Field, 42 km N of Andamooka. AD (2 sheets). EASTERN (4 seen): J.Z. Weber 2207, 6.viii.1971, 5 km W of vermin fence near Broughams' Cottage, which is on the E side of the S.A. - N.S.W. border and c. 155 km NNW of Broken Hill. AD; n.v.: CHR, NSW. MURRAY (1 specimen): R. Bates 10147, 14.viii.1987, 6 km N of Pine Valley Station. AD. QUEENSLAND. GREGORY NORTH (2 seen): P. Copley 819, 24.vi.1981, Eastern Simpson Desert, between c. 45-75 km NW of Birdsville. AD. - S.L. Everist 3979, 11.vi.1949, Currawilla, about 100 miles W of Windorah; 5 Mile Paddock. BRI. GREGORY SOUTH (Iseen): P.E. Conrick 2312, 6.vi.1988, Barrioolah [Baryulah] Waterhole, Nappa Merrie Station. AD; n.v.: BRI. MARANOA (1 seen): Helen I. Aston 2461, 1.ix.1983, 20 km NE of St George along the road to Surat. 29 km S of Bindle. AD (ex MEL) BRI. MITCHELL. D. Davidson 3506, iii.1953, 16 miles NW of Longreach. BRIU3259. WARREGO (2 seen): C. T. White 12080, 29.iii.1941, Eulo. NSW. NEW SOUTH WAI FS. NORTH FAR WESTERN PLAINS (9 seen): C.W.E. Moore 8236, 5.x.1981, ''Mt Mulyah", about 60 km NW of Louth. CANB. - J. Pickard 2381, 26.vii.1973, 11 km SW "Yancannia". NSW. - W.E. Mulham 1137, 18 Aug 1977, "Burrawantie". NSW. SOUTH FAR WESTERN PLAINS (2 seen) W.E. Mulham W787, viii.1974, Kinchega National Park. NSW. REGION UNKNOWN (2 seen). Glossostigma cleistanthum W.R. Barker, sp. nov. G. spathulatum auct non Wight & Am. ex Am., partly: J. Black, FI. S. Austral. (1926) 510. G. submersum auct. non Petrie: ?Petrie, Trans. N. Zeal. Inst. 23 (1890) 401, partly (Peine WELT60049 appears to have been part of the type collection of G. submersum which otherwise comprises many sheets of G. diandrton). G. sp.: W.R. Barker in Jessop, FI. Cent. Austral. (1981) 332, fig. 431C. G. sp. A: W.R. Barker, Evolution FL Fauna Arid Austral. (1982) 344, 346, 347; W.R. Barker in Jessop & Toelken, FL S. AustraL (1986) 1280, fig. 581D. Species nova staminibus duobus G. diaruiro affinissima, non solum differt a speciebus omninibus diffen floribus cleistogamis el fructibus subsessilibus, sed etiam a G. elatinoides lobis tribus calycis et a G. trichodes FvM. et G. drummondii Benth. staminibus duobus. Holotypus: W.R. Barker 3558, 23.ix.1978. South Australia.Region 7: Eyre Peninsula. South extremity of main north-south ridge of Carappee Hill, ca. 7 km by road ENE of Darke Peak, ca. 100 m N of road. (33°261/2'S 136°16'E). Prolific in occasional rockholes. In dark brown silt sometimes with Limosella curdieana (Barker 3560); within 20 m of pool with Glossostigma sp. (Barker 3559). On slopes of mountain with granite outcropping; ephemeral pools in depressions in granite. Creeping herb, submerged in ca. 10 cm water, but 72 J. Adelaide Bot. Gard. (15)1 (1992) New species of Peplidium & Glossostigma in view of heavy rains over prior 2 days, possibly formerly exposed. Cleistogamous. Fruits hard, downturned in silt. Material fixed in ethanol. AD97930260. Isotypi: 5 duplicates to be distributed. Small, glabrous, creeping, aquatic or terrestrial, cleistogamous, ephemeral or ?short-lived perennial herb, sometimes forming dense mats. Leaves in spaced pairs, 4-45 mm long, with the mid vein apparent throughout the lower side, sometimes obscure on drying, the thin flat, white to pale green petiole gradually dilated into a more or less thick, narrow obovateor oblong, obtuse, porrect, green or reddened blade (0.15-) 0.3-1 times longer and 1-3 times broader than the petiole.Pedicels usually 0-0.5 mm long, shorter than the leaves, downturned in fruit, rarely 5-9 mm long and erect. Calyx urceolate, green, enlarging to 1.5- 3 mm long in fruit, never opening. Corolla rudimentary. Stamens 2, included. Stigmatic lobe narrow elliptic. Seed,s 0.3-0.8 mm long. G. cleistanthum is widely distributed though rare across central and south-eastern mainland Australia and in New Zealand. It grows in wet-montane to arid regions, in silt in rock pools, in clay on creekbeds, on swamp margins or river flats or in dams, and flowers and fruits whether exposed or submerged. This species is distinguished from its congeners by its flowers which neveropen, its rudimentary corolla, and its usually sessile or subsessile flowers and fruits. The specific epithet derives from the first characteristic, coming from the Greek cleistos, meaning closed, and the Latinized adjectival form of the Greek anthos, flower. The proposal that the flowers are cleistogamous is supported not only by observation, but also by an extremely low pollen-ovule ratio (Barker 1982).
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